US3594897A - Method of constructing a magnetic core memory plane - Google Patents

Method of constructing a magnetic core memory plane Download PDF

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Publication number
US3594897A
US3594897A US825298A US3594897DA US3594897A US 3594897 A US3594897 A US 3594897A US 825298 A US825298 A US 825298A US 3594897D A US3594897D A US 3594897DA US 3594897 A US3594897 A US 3594897A
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United States
Prior art keywords
cores
flexible sheet
sheet
adhered
memory plane
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Expired - Lifetime
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US825298A
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English (en)
Inventor
Thomas Philip Fulton
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RCA Corp
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RCA Corp
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Publication date
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C5/00—Details of stores covered by group G11C11/00
    • G11C5/02—Disposition of storage elements, e.g. in the form of a matrix array
    • G11C5/04—Supports for storage elements, e.g. memory modules; Mounting or fixing of storage elements on such supports
    • G11C5/05—Supporting of cores in matrix
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y10T29/49069—Data storage inductor or core

Definitions

  • the edges f the cores are imbedded an amount equal to 264/272 340/174 340/174 340/174 MA about one-half the dimension radially between the inner and [SI] IliLCl H011 7/06 outer Surfaces f the cores so that the holes in the cores are [50] Flew of Search" 29/604; fully exposed for wires to be threaded therethrough.
  • the cores 340/174 MA; 264/272 tend to spring back to their set positions after being displaced in any direction during the assembly of a memory plane.
  • references cued completed memory plane includes the flexible sheet and UMTED STATES PATENTS rubber-adhered cores as an integral part of the construction to 2,985,948 5/1961 Peters 29/604 protect the cores from mechanical shock, thermal changes, 3,085,314 4/l963 Leiching 29/604 etc.
  • the present invention relates to ferrite magnetic core memory plane construction.
  • Core memory planes are customarily constructed by a method including the steps of l. positioning ferrite magnetic cores in a jig having sockets for receiving the cores, the jig including means for shaking the cores into the sockets, and vacuum holding means for retaining the cores in the sockets, 2.
  • the cores are edge embedded in the resin coating to a depth equal to about one h If of the radial distance between the outer and the inner surfaces ofthe cores.
  • the thickness of the resin coating is selected to provide a small but significant amount of resin between the supporting sheet and the closest portions of the cores. The cores are thus tenaciously and resiliently held during the stringing of wires through the cores, and during subsequent use in a memory.
  • FIG. 1 is a diagram illustrating the apparatus for priming the surfaces of a bulk quantity of ferrite cores with a primer such as polymerized silane;
  • FIG. 2 is a diagram illustrating the step of pressing the coated surface ofa flexible sheet down onto cores held in position in'a vacuum jig;
  • FIG. 3 is a diagram illustrating adhered cores on the flexible sheet after removal from the vacuum jig.
  • FIG. 4 is a diagram illustrating the adherence of the flexible sheet carrying adhered-cores onto a rigid substrate, and the threading of wires through the cores.
  • FIG. 1 DESCRIPTION OF THE PREFERRED EMBODIMENT REference is not made to FIG. 1 for a description of a method of priming ferrite magnetic cores to ensure their subsequent adhesion to a silicone rubber coating on a flexible sheet.
  • the apparatus shown includes a conventional electrically operated vibrator 10, a liquid container 12 resting on and vibrated by the vibrator l0, and a core container 14 nested on top of the liquid container 12.
  • the core container 14 has a perforate bottom 16 to permit the free passage therethrough of vapor from the liquid container 12.
  • the liquid container 12 includes a pipe connection 18 through which an inert gas of known moisture content is supplied. Provision is also made for the supplying of heat to the liquid container 12. The heat may be supplied by heating the gas fed to the container through the pipe 18. Alternatively the supporting member 19 may include a heating element for heating the liquid in the container 12.
  • a measured quantity, such as 10 cc, of an organosilicon liquid is poured into the liquid container 12
  • the preferred liquid is a silane, specifically, gamma-aminopropyltriethoxysilane sold by General Electric Co. under designation GE-SC-3900.
  • GE-SC-3900 gamma-aminopropyltriethoxysilane sold by General Electric Co. under designation GE-SC-3900.
  • GE-SC-3900 gamma-aminopropyltriethoxysilane sold by General Electric Co. under designation GE-SC-3900.
  • GE-SC-3900 gamma-aminopropyltriethoxysilane sold by General Electric Co. under designation GE-SC-3900.
  • GE-SC-3900 gamma-aminopropyltriethoxysilane sold by General Electric Co. under designation GE-SC-3900.
  • Nitrogen has having a known moisture content is fed through the pipe 18
  • the temperature in the liquid container l2 may be about 220 C, which may be achieved by preheating the gas to a sufficiently-higher temperature to allow for the heat losses in pipe 18.
  • the heat applied to the silance liquid causes it to vaporize and pass in vapor form up through the cores in the core container 14.
  • the entire assembly is vibrated by the vibrator 10 in order to prevent the ferrite cores 15 from sticking to each other and to ensure an even exposure of all surfaces of all cores to the silane vapor.
  • the thickness of the silane coating deposited on the ferrite cores 15 is determined by the amount of moisture present on the cores themselves, and the amount of moisture present on the cores themselves, and the amount of moisture present in the gas supplied under pressure to the liquid container 12, and, of course, also on the length of time that the cores are subjected to the silane vapor.
  • the cores will normally be coated to a thickness of perh ps a few hundred molecules of polymerized silane in a period of about 10 or 15 minutes, during which time all of the 10 cc of silane liquid is vaporized at a temperature of 220 C.
  • FIG. 2 showing a conventional vacuum jig 20 having sockets for receiving the edges of four cores in a desired pattern.
  • the vacuumjig 20 will normally accommodate a very large number of cores, such as an array of 64 X64 cores, rather than merely the four cores shown by way of illustration in the drawing.
  • the vacuum jig includes internal passageways (not shown) coupling the vacuum connection 22 t the bottoms of the core-receiving sockets on the top surface 24 of the jig.
  • the vacuum jig 20 is positioned on a vibrator (not s own) so that bulk cores poured onto the top surface are agitated until they randomly fall into sockets, and then are held in place by the vacuum.
  • the sockets in the vacuum jig 20 are dimensioned to receive the cores to a depth equal to about one-half of their outside diameter.
  • a flexible sheet 26 coated with a resin 28 is drape'rolled onto the exposed edges of the cores positioned in the jig 20.
  • the flexible sheet 26 may be a glass fabric sheet or tape presized with a mixture of the uncured rubber and a reactive silane primer. Sheet 26 may have a thickness of about 0.002 inch. On the other hand, similar flexible sheets constructed of plastic such as Mylar, or thin flexible metal, may be used. It is important that the sheet 26 be sufficiently flexible so that it can accommodate slight variations in the heights of the cores in the jig 20. This is necessary because the cores are normally of very small diameter, such as 0.030 inch or less, and the vacuum positioning jig 20 cannot be economically constructed with such a high degree of planar accuracy as to accommodate a rigid planar sheet 26.
  • the flexible sheet 26 is coated with an uncured resin, which is preferably an uncured silicone rubber, specifically. diamethyl silicone rubber sold by Dow coming under designation Mod. l98'," and also sold by General Electric Co.
  • an uncured resin which is preferably an uncured silicone rubber, specifically. diamethyl silicone rubber sold by Dow coming under designation Mod. l98'," and also sold by General Electric Co.
  • a typical formulation is as follows:
  • the thickness of the silicone rubber coating 28 on the flexible sheet 26 is made to be about one-half the radial wall thickness of the cores, i.e. the radial distance between the outer and the inner surfaces of the cores.
  • a coating thickness of about 0.0035 inch is suitable when the cores have an outside diameter of 0.030 inch and an inside diameter of 0.018 inch.
  • the degree of imbedment of the cores may be in the range of from one-fourth of, to the full amount of, the radial wall thickness. However, care must be taken that the imbedment does not exceed the full amount of the wall thickness, in which case the holes in the cores would not be fully exposed for the treading of wires therethrough.
  • a silicone rubber coating 28 having a thickness of 0.0035 inch is also suitable for use with cores having an outside diameter of 0.020 inch and an inside diameter of 0.012 inch.
  • the radial wall thickness is 0.004 inch
  • the cores may be imbedded about three-fourths of the radial wall thickness, or 0.003 inch, into the 0.0035-thick rubber coating.
  • the described degrees of imbedment leave a small but significant thickness of the silicone rubber coating 28 between the flexible sheet 26 and the nearest peripheral edges of the cores, whereby the cores are more resiliently mounted than would be the case if the core peripheries touched the flexible sheet 26.
  • the desired degree of imbedment of the cores into the silicon rubber coating 28 is accomplished by applying a downward force of about pounds per square inch onto the flexible sheet 26. This force may be applied to the top side of the flexible sheet with a roller or by a rubbing action by the gloved fingers of an operator.
  • the desired embedment of the cores can be facilitated by employing the vacuum applied to the vacuum jig to draw the flexible sheet 26 down onto the cores. When the vacuum is employed, it is desirable to also rub the top surface of the flexible sheet 26 to urge the sheet against the cores. However, one or the other, or both, of the described methods may be employed to ensure the desired uniform embedment of the cores in the uncured resin 28.
  • the flexible sheet 26 with embedded and adhered cores is then lifted off the vacuum jig 20 and turned over with the cores upright as shown in H0. 3.
  • the cores are shown embedded in the uncured resin 28 an amount equal to about one half of the radial distance between the outer and inner surfaces of the cores. With this degree of embedment, the holes in the cores are sufficiently above the surface ofthe resin coating 28 to facilitate the threading of wires through the cores.
  • the flexible sheet with adhered croes as shown in FIG. 3 is placed in an oven to cure the resin or silicone rubber 28.
  • the polymerization of the silicone rubber is preferably accomplished by keeping the sheet with adhered cores in an oven at a temperature of about 155 C. for about one hour.
  • the cores are precisely positioned in an extremely flexible, durable and resilient manner. That is, the cores can be disturbed by pressing a finger or an object against the cores causing them to be bent down so their flat surfaces are parallel with the surface of the silicone rubber coating 28. On removal of the deforming force, the cores merely spring back to their original precisely-determined positions.
  • the flexible sheet 28 may be rolled up and otherwise deformed without changing the precise positions of the cores.
  • a rigid substrate 30 includes electrical connector terminals 32 arranged around the periphery.
  • the substrate 30 is provided with an adhesive 34, which is preferably applied to the desired area of the substrate by spraying through a mask,
  • the adhesive 34 is preferably a moisture curing, ethanol-evolving silicone, one-component adhesive.
  • the side of the flexible sheet 26 opposite from the side carrying the magnetic cores is drape-rolled onto the adhesive 34 on the rigid substrate 30. Registry between the cores and the electrical terminals 32 is ensured by employing any suitable guide pin arrangement.
  • the bottom of the flexible sheet 26 is pressed into firm contact with the adhesive 34 by passing a soft or sponge-rubber roller over the top of the flexible sheet 26 and over the cores imbedded therein. The roller causes a temporary displacement of the cores over which it passes, but the cores are so resiliently secured that they spring back to their correct positions immediately after being passed over by the roller.
  • wires 40 are threaded in various directions through the cores.
  • the resilient mounting of the cores greatly facilitates threading of the wires.
  • Each wire used has a relatively stiff needle" at the leading end which is passed through thecores.
  • the cores are so resiliently mounted that they momentarily adapt their position to receive a slightly misdirected needle. This facilitation of the threading of a wire through the cores is also accompanied with a significant reduction in the danger of core breakage or damage during the wire threading.
  • the ends of the wires are electrically connected by soldering or otherwise to the peripheral terminals 32.
  • the resulting final product is a ferrite magnetic memory core plane assembly suited for combination with other similar planes into a memory stack which, with the addition of drive and sense electronics, constitutes a computer memory.
  • the silicone rubber coating 28 and the flexible sheet 26 remain a permanent, integral part of the final memory product.
  • the individual cores are protected from vibration and consequent damage in shipment, and later in use in a memory system.
  • the cores are constrained by the wires passing through them, but this constraint permits an undesired movement of the cores on the wires.
  • the edges of the cores embedded in the silicone rubber provide an additional very resilient constraint on the cores so that they are effectively preventedfrom any undesirable vibration, and yet are free to move a small amount in the process of absorbing a shock or adapting to thermal expansion and contraction effects.
  • the silicone rubber coating 28 in which the cores are embedded is chemically inert and unaffected by the strong solvents normally employed to degrease an assembled memory plane to remove all vestiges of soldering fluxes and contaminating materials. Furthermore the silicone rubber is physically resilient over a very wide ambient temperature range such as from -55 C. to +1 C.
  • silane is garnma-aminopropyltriethoxysilane.

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  • Magnetic Heads (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
US825298A 1969-05-16 1969-05-16 Method of constructing a magnetic core memory plane Expired - Lifetime US3594897A (en)

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US82529869A 1969-05-16 1969-05-16

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JP (1) JPS4925055B1 (en))
AT (1) AT307093B (en))
AU (1) AU1520670A (en))
CA (1) CA926006A (en))
CS (1) CS152251B2 (en))
DE (1) DE2023220A1 (en))
ES (2) ES379488A1 (en))
FR (1) FR2042701B1 (en))
GB (1) GB1304285A (en))
NL (1) NL7007129A (en))

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3859720A (en) * 1972-12-27 1975-01-14 Jury Alexandrovich Burkin Method of manufacturing memory stacks
US4473892A (en) * 1981-06-02 1984-09-25 Ampex Corporation Rugged, vibration resistant magnetic core stack having low mass

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3640767A (en) * 1969-05-16 1972-02-08 Rca Corp Encapsulated magnetic memory element
US12170849B2 (en) 2022-02-04 2024-12-17 Applied Materials, Inc. Pulsed illumination for fluid inspection

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2985948A (en) * 1955-01-14 1961-05-30 Rca Corp Method of assembling a matrix of magnetic cores
US3085314A (en) * 1957-09-30 1963-04-16 Ibm Method of making a core plane assembly

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3305848A (en) * 1956-01-26 1967-02-21 Sperry Rand Corp Toroidal core memory array
US3640767A (en) * 1969-05-16 1972-02-08 Rca Corp Encapsulated magnetic memory element
JPS5152263Y2 (en)) * 1971-01-28 1976-12-14

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2985948A (en) * 1955-01-14 1961-05-30 Rca Corp Method of assembling a matrix of magnetic cores
US3085314A (en) * 1957-09-30 1963-04-16 Ibm Method of making a core plane assembly

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Auletta et al.; Taped Cores ; IBM TECH. DIS. BULLETIN Vol. 11 No. 7 12/1968 pages 726 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3859720A (en) * 1972-12-27 1975-01-14 Jury Alexandrovich Burkin Method of manufacturing memory stacks
US4473892A (en) * 1981-06-02 1984-09-25 Ampex Corporation Rugged, vibration resistant magnetic core stack having low mass

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AU1520670A (en) 1971-11-25
FR2042701A1 (en)) 1971-02-12
AT307093B (de) 1973-05-10
GB1304285A (en)) 1973-01-24
CS152251B2 (en)) 1973-12-19
ES379488A1 (es) 1972-10-16
ES382748A1 (es) 1972-11-16
NL7007129A (en)) 1970-11-18
JPS4925055B1 (en)) 1974-06-27
FR2042701B1 (en)) 1974-09-20
CA926006A (en) 1973-05-08
DE2023220A1 (de) 1970-11-19

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